Nut-lock



(No Model.)

M. 1). BOWEN.

- NUT LOOK;

No. 550 246. Patented Nov. 26,1895,

LWMW W J AN DREW EGRAHAM. PHOTOUTNO. W

NiTED STATES PATENT OFFICE.

MILES D. BOIVEN, OF PHILADELPHIA, PENNSYLVANIA.

NUT-.LOCK.

SPECIFICATION forming part of Letters Patent No. 550,246, dated November 26, 1895.

Application filed March 18 1895.

T0 at whom it may concern:

Be it known that I, MILES D. BOWEN, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Nut-Locks; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification. a

This invention is directed to devices for locking nuts, and especially to that class in which the locking is effected by the engagement with the threads of the bolt of a dog pivotally connected to the nut, such a construction having been patented to me on the 29th day of January, 1895.

My invention relates to improvements on the said patented invention, the object of said improvements being to simplify the construction with a view to reducing the expense incidental to the manufacture of the nut-locks.

In the construction covered by my patent referred to the dog is provided at its engaging edge with a shallow groove which divides said edge into two blunt teeth, the latter being serrated and adapted to engage the threads of the bolt to preclude the loosening of the nut.

In my present invention I attain the same results by the employment of a dog, the engaging edge of which is formed with a single tooth, which is serrated, and in practice engages the adjacent sides of two of the threads of the bolt. Another feature of my present invention is an improved pin for pivotally connecting the dog to the nut, said pin being cheaply produced and serving to prevent accidental loosening of the dog and the disconnection of the latter for improper reasons.

I will now describe in detail my improved nut-lock, and in connection with such description attention is directed to the accompanying drawings, in which Figure 1 is a perspective view of my improved nut-lock. Fig. 2 is a front elevation of the same. Fig. 3 is a sectional view of the Serial No. 542,193. (No model.)

head a and the external threads a, and B is the nut centrally apertured and threaded for engagement with the bolt in the usual manner.

The dog is shown at O and is in general outline triangular, the engaging edge of same being outwardly curved, the radius of said curve gradually increasing in length from right to left, as shown. Said engaging edge is beveled on both sides to provide a single engaging-tooth c, which occupies in practice the space between two threads, the beveled sides of said tooth engaging the adjacent sides of two threads by a cam or eccentric action. To increase the friction and thereby insure a positive engagement of the dog with the threads the engaging edge or tooth is provided with serrations c, which bite into the threads when an effort is made to loosen the nut.

As before stated, the dog is pivotally secured to the outer face of the nut, and for this connection I provide a smooth pin (Z, which passes through a hole 0 in the dog and into anaperture b in the nut. The hole 0 is countersunk at c and the pin in practice is provided With a head conforming to said countersunk portion, or may be upset to fill said portion, as desired. In practice the pin is forcibly driven in place and tightly held by frictional contact with the sides of the aperture 1) and cannot be withdrawn by the employment ofordinary means.

In operation the dog requires but a slight movement, and its peculiar shape gives a preponderance of weight on one side, and as a consequence a contact of the dog and threads is automatically accomplished during a portion of the revolution of the nut. The peculiar shape and nature of the engaging edge of the dog insures a positive engagement between the dog and threads when the tendency of the nut is to loosen, and the latter is consequently tightly locked and can only be taken off when the dog is moved by hand. The dog may be made reversible in order to adapt same to right or left threaded bolts. The invention maybe applied to existing nuts, and by reason of the shape of the engaging threads to which said edge conforms, and a smooth pin passed through an aperture in the dog and driven into the plain aperture in the nut whereby it is frictionally held against displacement, all as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

MILES D. BOWEN. Vitnesses:

J. (J. HULKY, JOHN F. TURNER. 

